SB220/221

[Francisco Viegener]

I have a 220 and I suggest to visit the web page from Richard Measures, so
far I know, he is the father of all the modification seen in the Harbach
circuits more or less.
The information and modification suggested by Measures are very simple and
clear, I did in my SB220 all of them but still working on the High Speed
Switching to replace the electromecanical relay.
You will find that the circuits are very similar to the Harbach circuits ,
but Measures explain why and how they work.
http://www.vcnet.com/measures/
You can buy from him some parts if you want to do his modification.
I help me by phone and email.
I hope this will help!!
Francisco LU3EEC

----- Original Message -----
From: "Mark Graalman WB8JKR" <wb8jkr at JUNO.COM>
To: <HEATH at LISTSERV.TEMPE.GOV>
Sent: Sunday, April 28, 2002 3:41 PM
Subject: Re: SB220/221


>   John,
>
>   I have considerable experience with the 220 and 200, but I
> have NO experience with the Harbach mods so many of them
> have now, and trying to trouble shoot a modified amplifier via
> Email isn't a real easy thing to do.
>
> Mark  WB8JKR
>
>
> On Sun, 28 Apr 2002 09:22:58 -0700 John C Owens <jcowens3 at JUNO.COM>
> writes:
> > It really amazes me that out of over 700 subscribers to the Heathkit
> > reflector, there is only 1 guy (thanks George, W5RUK) who knows
> > anything
> > about the SB220/221. I thought these amplifiers were legend and that
> > the
> > ham world is still very populated with them. I sure see a bunch of
> > them
> > at the larger swapmeets. Maybe they have all been turned into scrap
> > to
> > keep the few remaining amplifiers alive??? I doubt it. I hope to
> > hear
> > from others on this amplifier so I can get the 2 I have back on the
> > air
> > where they belong. Your help/feedback would be appreciated. I am
> > trying
> > to sort through the various mods that have been documented over the
> > years
> > to determine which of those should be done. Your help would be
> > appreciated. After all, isn't that why we have reflectors like
> > this??
> >
> > Thanks - John Owens (N7SEJ)
> >
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